Optical Shape Sensor Registration for Interventional Devices
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Solution Overview
Problem
Current optical shape sensing technologies for interventional medical procedures face errors in registration between devices, such as OSS and X-Ray or ultrasound imaging systems, leading to interruptions and increased procedure time due to the need for repeated X-Ray projections and manual re-registration, which can expose patients and clinicians to additional radiation.
Innovation Solution
A system that uses optical shape sensing signals to identify and register the shape of an interventional medical device in both X-Ray and ultrasound coordinate spaces, allowing for continuous and accurate maintenance of registration without additional X-Ray imaging, leveraging three-dimensional segmentation and transformation matrices to align coordinate systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If re-registration is performed using traditional methods with additional X-Ray projections, then registration accuracy is restored, but patient and clinician radiation exposure increases
Solution Approach 1:
The patent introduces an intermediary registration method that uses previously acquired X-Ray projection images and computational algorithms to perform re-registration without requiring new X-Ray exposures. The system uses image processing and coordinate transformation as intermediaries to restore registration accuracy while avoiding additional radiation
Solution Approach 2:
The system performs preliminary actions by acquiring and storing multiple X-Ray projection images at the beginning of the procedure. These pre-acquired images serve as a repository for future re-registration operations, eliminating the need for additional X-Ray exposures when registration drift occurs
2Measurement precision
If re-registration is performed using traditional methods with manual device identification, then registration accuracy is restored, but procedure time increases
Solution Approach 1:
The patent replaces the manual mechanical process of device identification and registration with an automated computational system. Image processing algorithms automatically identify the interventional device in the stored X-Ray images and compute transformation matrices, eliminating time-consuming manual operations
Solution Approach 2:
The system performs self-service by automatically detecting the interventional device, calculating registration transformations, and updating coordinate systems without requiring clinician intervention. The automated pipeline handles the entire re-registration process independently
3Measurement precision
If additional X-Ray projections are taken for re-registration, then registration accuracy is improved, but procedure complexity and resource usage increase
Solution Approach 1:
The system recovers value from previously discarded or underutilized X-Ray projection images by implementing a repository that stores these images for later re-registration operations. Instead of acquiring new images, the system retrieves and reuses existing images, simplifying the re-registration process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise and continuous tracking of interventional medical devices during procedures, reducing radiation exposure and procedure time by maintaining accurate registration without the need for repeated X-Ray projections, thus improving the flow and safety of medical interventions.
Implementation Method 1
OSS uses light along a multicore optical fiber that conforms to the shape of the interventional medical device during the interventional medical procedure. The principle involved makes use of distributed strain measurements in the optical fiber using characteristic Rayleigh backscatter or controlled grating patterns.
Implementation Method 2
Registration from an OSS device to an X-Ray imaging system can be accomplished via a transform TOX from the OSS device to the X-Ray imaging system. Registration from an ultrasound imaging system to the X-Ray imaging system can be accomplished via a transform TUX from the ultrasound imaging system to the X-Ray imaging system.
Data Source
AI summary
A system for tracking location of an interventional medical device (01) includes an interface (193) and a controller (190). The interface (193) interfaces the system to an optical shape sensing device (102) which has a shape that conforms to a shape of the interventional medical device (01). The controller (190) includes a memory (191) that stores instructions and a processor (192) that executes the instructions. The instructions cause the system to identify a shape of the optical shape sensing device (102) using optical shape sensing signals received from the optical shape sensing device (102) via the interface (193), and identify a shape of the interventional medical device (01) in a first coordinate space of a first imaging system that images the interventional medical device (01) in a first imaging mode. The instructions also cause the system to register the interventional medical device (01) to the first coordinate space.